personnally for birds to do this distance i would train them harder, it has been done, some people do it, but alot of ppl lose them, i once took liberty of a pigeon, was raced and lost as a young bird came back the following old bird season towards a stonehaven race, chucked it straight in lo and behold who was my first bird and hi up in the combine, you guessed it that didnt have no tosses just raced as yb